Based on tenail, new words formed by adding one letter at the beginning or end:
finflate   gatingle  elating  gelatin  genital   kantlike   mailment  aliment   oelation  toenail   ppantile   rlatrine  ratline  reliant  retinal  trenail   selastin  entails  nailset  salient  saltine  slainte  tenails   ualunite   vventail